<style>
    .select-group {
        display: inline-block;
    }
</style>

<div class="select-group pull-right">
    <form class="form-inline" action="{$_selectUrl}" method="get">
        {peter:foreach exp="$_selectList as $_select"}
        <div class="form-group">
            <label>{$_select.title}</label>
            <select class="form-control" name="{$_select.name}">

                {peter:foreach exp="$_select['options'] as $_value => $_text"}
                    {peter:if exp="input($_select['name']) == $_value"}
                        <option value="{$_value}" selected>{$_text}</option>
                    {peter:else /}
                        <option value="{$_value}">{$_text}</option>
                    {/peter:if}
                {/peter:foreach}
            </select>
            {notempty name='_select.desc'}
                <span>({$_select.desc})</span>
            {/notempty}
        </div>
        {/peter:foreach}
    </form>
</div>

<script>
    (function () {
        var selects = $('.select-group').find('select');
        selects.on('change',function () {
            var form = $(this).parents('form');
            form.submit();
        });
    })();
</script>